Add support for compiling protobufs and running tests

Rakefile

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+
+# Load all our tasks from the tasks directory
+Dir[File.expand_path(File.dirname(__FILE__) + '/tasks/*.rake')].each do |f|
+  load f
+end

tasks/protobuf.rake

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+namespace :protobuf do
+  task :compile do
+    sh 'protoc --ruby_out=lib -I proto ./proto/*.proto'
+  end
+end

tasks/spec.rake

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+require 'rspec/core/rake_task'
+
+RSpec::Core::RakeTask.new(:spec) do |t|
+end
+
+task :default => ['protobuf:compile', 'spec']